there should me option on message that will delete all viewed messages when they are read a this optin can be changed by the users

Lol, its already there!
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if you click the above link, it will delete all the messages (i.e viewed msg) except saved/reported ones

with clcingon thAT they will bedeleted borther

What do you mean? I didnt understood anything on your second post! Can you explain a bit more pls?

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meant that when we wll clickon that option the messages will delete themselves without our clicking

Lol you have to click on that option to delete viewed messages! Or else it wont delete it! Why are you thinking some unuseful things? (even it is still there? :3) I guess no change is required! Current system is good!